A very significant case involving core privacy protections is now being litigated, where the Obama Justice Department is seeking to obtain from Yahoo "all emails" sent and received by multiple Yahoo email accounts, despite the fact that DOJ has never sought, let alone obtained, a search warrant, and despite there being no notice of any kind to the email account holders:

In a brief filed Tuesday afternoon, the coalition says a search warrant signed by a judge is necessary before the FBI or other police agencies can read the contents of Yahoo Mail messages -- a position that puts those companies directly at odds with the Obama administration.